Apparatus for sorting transparent or translucent papers, film foils, and the like



March 7, 1933. Q BUCHNER 1,900,633

APPARATUS FOR SORTING TRANSPARENT 0R TRANSLUCENT PAPERS, FILM FOILS, AND THE LIKE Filed D80. 21, 1928 /n Vent-or:

' light.

advantageous, as the separating out of faulty Patented Mar. 7 1%33 eaten ares Lactate earner CARL IBfiCHNER, 0F IHANNHEIM-WALDHOE'GERMANY, ASSIGNOR OF. ONE-HALF T0 IPAPYR'US A.-G., 0F MANNHEIM-WALDHOF, GERMANY APPARATUS FOR SORTING TRANSPARENT 0R TRANSLUGENT PAPERS, FILM FOILS, AND THE LIKE Application filed December 21, 1928, Serial No. 327,725, and in Germany December 23, 1927.

This invention has for its object to speed up and cheapen the sorting of papers, film foils and the like. which is necessary for separating ont from the goods parts having folds, cracks or spots or which, for instance, have not the correct colour tone.

It consists substantially in this that be fore the actual separating out of the faulty parts, which is usually carried out by hand by skilled workers, piles or webs consisting of several layers are illuminated by the transmitted light of a white or coloured source of light, such that faulty places can be detected in the transmitted light. The actual sorting work is then limited to such piles or parts of paper or film webs, the illumination of which by transmitted light has shown faulty places. All other piles or parts of the web, on the other hand, require no further examination.

It is obvious that in this way a considerable part of the time and cost for sorting can be .saved. The advantage becomes the greater,

the better the arrangement of the machine, in which the paper or the like is produced, rolled up, smoothed, out, and the like, and the more suitable the mode of operation adopted.

The material to be sorted may be passed either in the form of long webs of paper or in the form of sheets, either by mechanical means Or by hand in front of the source of Sorting in the form of sheets is more piles of sheets is more easily and conveniently carried out than the removal of faultyplaces from long webs. It is most advantageous to carry out the sorting directly in conjunction with the machines in which rolls of the material are cut into separate sheets, as the sorting can take place both before and after the cutting operation.

The accompanying drawing shows diagrammatically a simple constructional form of the invention as applicd'to paper in the.

form of sheets.

The paper coming from the rolls a is drawn off continuously or intermittently at b and cut at 0 into sheets, so that separate piles d are formed, the number of sheets in which corresponds to the number of rolls (1. These piles are conveyed by means of a conveyor device 6 consisting of narrow bands, cords or the like past any suitable source of light consisting for instance of a ground glass plate f behind which incandescent lamps g are mounted. As they travel' over the ground glass plate f the piles d are inspected. Sound piles travel to the sheet delivery de- Vice h. Faulty piles on the other hand are conveyed away by the conveying device '5 which with its bands or cords can be interposed at k in the path of the transporting device e and are deposited at Z. The sheets deposited at Z are thereupon resorted in the usual manner. I

The speed at which the piles are conveyed may be uniform or variable. Thus, within the range of the source of light there may be a temporary reduction in the speed or a pause, for the purpose of assisting the inspection. The first sorting by transmitted light, which may for instance be carried out with piles of twenty sheets eachmay be followed by a second sorting by transmitted light with piles of five or ten sheets, whereby the actual quantity of paper remaining to be sorted by hand is further reduced, and so on.

What I claim is An apparatus of the class described, comprising the combination with a light transmitting device and sheet conveying'means.

means I for simultaneously unwinding the Webs from the rollers, grouping them in superposed relation and delivering the superposed webs to the said sheet conveying means, severing means interposed between said web grouping and delivering means and said sheet conveying means for dividing the superposed webs into groups of superposed sheets and means for separating the groups of sheets after passing from the light transmitting devlce.

In testimony whereof I have signed my name to this specification.

CARL B'UCIDIER. 

